Function serve_session 

pub async fn serve_session<B, N, H, S, K>(
    pipeline: &Pipeline<B, N, H>,
    principal: Principal,
    src: &mut S,
    sink: &mut K,
    cfg: &SessionConfig,
) -> SessionEnd
where
    B: MultipartBlobStore,
    N: NamespaceStore,
    H: HookSet,
    S: FrameSource,
    K: FrameSink,

Serve one ssh-frame session: the handshake, then one verb per top-level frame until Close, a clean end of stream, a protocol error or a failure. Each verb runs on pipeline as principal.

The pipeline must be configured with AuthMode::TransportIdentity: the transport has already authenticated the peer, and no replay record or quota is written. Any other mode ends the session at once with SessionEnd::ProtocolError, before reading a frame. Its upload limits should be super::upload_limits.

Responses and error frames are mkit serve’s, byte for byte (rust/tests/golden/ssh-serve/).